﻿
using UnityEngine;

/// <summary>
/// Tween the camera's orthographic size.
/// </summary>

[RequireComponent(typeof(Camera))]
[AddComponentMenu("UGUI/Tween/Tween Orthographic Size")]
public class UGUITweenOrthoSize : UGUITweener
{
    public override object fromValue { get { return from; } set { from = (float)value; } }
    public override object toValue { get { return to; } set { to = (float)value; } }

    public float from = 1f;
	public float to = 1f;

	Camera mCam;

    /// <summary>
    /// Camera that's being tweened.
    /// </summary>
    public Camera cachedCamera { get { if (mCam == null) mCam = GetComponent<Camera>(); return mCam; } }

	/// <summary>
	/// Tween's current value.
	/// </summary>
	public float value
	{
		get { return cachedCamera.orthographicSize; }
		set { cachedCamera.orthographicSize = value; }
	}

	/// <summary>
	/// Tween the value.
	/// </summary>
	protected override void OnUpdate (float factor, bool isFinished) { value = from * (1f - factor) + to * factor; }

	/// <summary>
	/// Start the tweening operation.
	/// </summary>
	static public UGUITweenOrthoSize Begin (GameObject go, float duration, float to)
	{
        UGUITweenOrthoSize comp = UGUITweener.Begin<UGUITweenOrthoSize>(go, duration);
		comp.from = comp.value;
		comp.to = to;

		if (duration <= 0f)
		{
			comp.Sample(1f, true);
			comp.enabled = false;
		}
		return comp;
	}

	public override void SetStartToCurrentValue () { from = value; }
	public override void SetEndToCurrentValue () { to = value; }
}
